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PARTICLE RESUSPENSION FROM AN ASPHALT ROAD CAUSED BY CAR AND TRUCK TRAFFIC

PARTICLE RESUSPENSION CAUSED BY SURFACE STRESSES FROM VEHICULAR TRAFFIC ON ROADS CAN PRODUCE A RENEWED DOWNWIND HEALTH OR ENVIRONMENTAL HAZARD. THESE HAZARDS INCLUDE THOSE DUE TO THE DOSE-TO-MAN INHALATION HAZARD OF RADIOACTIVE PARTICLES AS WELL AS AIRBORNE SALT AND LEAD DAMAGE ON TREES AND VEGETATION NEAR ROADS. PARTICLE RESUSPENSION CAUSED BY MOVING-VEHICULAR- GENERATED SURFACE STRESSES WAS DETERMINED BY USING SOLID ZNS TRACER PARTICLES PLACED ON A ROAD. THE FRACTION RESUSPENSION PER VEHICLE PASS WAS FROM 0.001 TO 1 PERCENT WITH THE GREATER RESUSPENSION CORRESPONDING TO INCREASED VEHICLE SPEEDS AND DRIVING DIRECTLY THROUGH THE DEPOSITED TRACER. FOR CONSTANT VEHICULAR CONDITIONS AND NO INTERVENING TRAFFIC, THE FRACTION OF PARTICLES INITIALLY PRESENT WHICH WERE RESUSPENDED DECREASED MARKEDLY WITH AN INCREASE IN DAYS AFTER THE TRACER WAS PLACED ON THE ROAD. /DOT/